A method for the preparation of a carbon molecular sieve adsorbent for methane-nitrogen separation

The carbon molecular sieve adsorbent prepared by modifying graphite and phenolic resin solves the problem of poor methane-nitrogen separation in existing technologies, achieving efficient gas separation and concentration, and is suitable for industrial methane recovery.

CN117680093BActive Publication Date: 2025-12-26SOUTHWEST RES & DESIGN INST OF CHEM IND
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Patent Information

Application Number
CN202311799735.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-26
Publication Date
2025-12-26
Estimated Expiration
2043-12-26

AI Technical Summary

Technical Problem

Existing carbon molecular sieve adsorbents suffer from low gas adsorption capacity and low separation coefficient in methane and nitrogen separation, making it difficult to achieve efficient methane and nitrogen separation.

Method used

Using modified graphite and phenolic resin as raw materials, carbon molecular sieve adsorbents with high nitrogen adsorption capacity and high methane selectivity are prepared through steps such as loading transition metal salts and carbon deposition, while optimizing the pore structure and interlayer spacing.

Benefits of technology

It significantly improves gas adsorption capacity and separation effect, enhances the separation performance of methane and nitrogen, and significantly improves the purity and yield of methane in the product gas, making it suitable for industrial applications.

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Abstract

The application discloses a preparation method of a carbon molecular sieve adsorbent for methane-nitrogen separation. The method comprises the following steps: 1) grinding graphite powder and placing the same in a metal salt solution, drying after sufficient stirring to obtain modified graphite; 2) placing phenolic resin powder in a metal salt solution, drying after sufficient stirring to obtain modified resin; 3) mixing the modified graphite and the modified resin, adding tar into the mixture, kneading and then extruding into a strip shape; 4) sufficiently drying the formed material, then transferring the material into a gas atmosphere calcination furnace, and calcining the material under an inert gas atmosphere for a certain time; and 5) performing programmed temperature heating on the obtained material under an inert gas atmosphere, introducing a carbon source, and depositing pyrolytic carbon on the surface of the material by a gas phase deposition method to obtain a carbon molecular sieve adsorption material. The carbon molecular sieve material is used as an adsorbent by adopting a pressure swing adsorption technology, has high adsorption capacity for nitrogen and high methane-nitrogen selectivity in methane-nitrogen separation application, and has a good industrial application prospect.
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